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/*******************************************************************************
* Copyright (c) 2009, Cloudsmith Inc and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Cloudsmith Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.p2.testserver.servlets;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URI;
import java.net.URLConnection;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.equinox.p2.testserver.LinearChange;
/**
* The ChopAndDelay deliver the content chopped up in smaller packets and adds delay
* between packets.
*
*/
public class ChopAndDelay extends BasicResourceDelivery {
int chopFactor;
private LinearChange delayFunction;
private long msDelay;
/**
* Create a file molester that turns content into gibberish.
*
* @param theAlias the path this servlet is registered under
* @param thePath the path to use as root for the alias
* @param chopFactor - a value between 1 and 12 where 1 is one byte, and 12 is 4k bytes at a time.
* @param delayFunction - function returning a series of delay values
*/
public ChopAndDelay(String theAlias, URI thePath, int chopFactor, LinearChange delayFunction) {
super(theAlias, thePath);
if (chopFactor < 1 || chopFactor > 12)
throw new IllegalArgumentException("chopFactor must be between 1 and 12 (inclusive) - was:" + Integer.valueOf(chopFactor)); //$NON-NLS-1$
this.chopFactor = chopFactor;
if (msDelay < 0)
throw new IllegalArgumentException("msDelay must be >= 0 - was:" + Integer.valueOf(chopFactor)); //$NON-NLS-1$
this.delayFunction = delayFunction;
msDelay = 0L;
this.delayFunction = delayFunction;
if (this.delayFunction.hasNext())
msDelay = delayFunction.next();
}
private static final long serialVersionUID = 1L;
protected void deliver(URLConnection conn, InputStream in, String filename, HttpServletRequest request, HttpServletResponse response) throws IOException {
// chop up all files
doChop(conn, in, filename, request, response);
}
protected void doChop(URLConnection conn, InputStream in, String filename, HttpServletRequest request, HttpServletResponse response) throws IOException {
LinearChange delayer = delayFunction.fork();
int contentlength = conn.getContentLength();
if (contentlength >= 0) {
response.setContentLength(contentlength);
String mimeType = computeMimeType(filename, conn);
response.setContentType(mimeType);
// We want to use a writer if we are sending text
if (mimeType.startsWith("text/")) //$NON-NLS-1$
{
PrintWriter writer = response.getWriter();
writer.flush(); /* write the headers and unbuffer the output */
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
int chunksize = 1 << chopFactor;
char buffer[] = new char[4096];
int read;
while ((read = reader.read(buffer, 0, buffer.length)) != -1) {
int nChunks = read / chunksize + (read % chunksize > 0 ? 1 : 0);
for (int i = 0; i < nChunks; i++) {
writer.write(buffer, i * chunksize, Math.min(chunksize, read - i * chunksize));
writer.flush();
if (msDelay > 0)
try {
Thread.sleep(msDelay);
} catch (InterruptedException e) {
// ignore
}
if (delayer.hasNext())
msDelay = delayer.next();
}
}
} else {
ServletOutputStream out = response.getOutputStream();
out.flush(); /* write the headers and unbuffer the output */
int chunksize = 1 << chopFactor;
byte buffer[] = new byte[4096];
int read;
while ((read = in.read(buffer, 0, buffer.length)) != -1) {
int nChunks = read / chunksize + (read % chunksize > 0 ? 1 : 0);
for (int i = 0; i < nChunks; i++) {
out.write(buffer, i * chunksize, Math.min(chunksize, read - i * chunksize));
out.flush();
if (msDelay > 0)
try {
Thread.sleep(msDelay);
} catch (InterruptedException e) {
// ignore
}
if (delayer.hasNext())
msDelay = delayer.next();
}
}
}
}
}
}
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